When mixing the batter, be sure the mixture is fully mixed - you don't want any clumps of egg whites or dry ingredients left. Do not over bake this cake as it will dry out and crack, it should still be quite pale when finished baking. This is best eaten after it has a chance to set but can definitely be served immediately after rolling - it will just be a little messy. Store in an airtight container in the fridge for 2-3 days.